Lathe attachment.



UNITED sTATEs PATENT OFFICE.

RICHARD RERVIG, yor CHICAGO, ILLINOIS, ASSIGN'OR To AMERICAN CAR ANDECUNDRY COMPANY, or sT. EoUIs, missoURL A CoRPoRATIoNoF NEW JERSEY.

v4inserm?. ATTACHMENT.

To all whom 'it may concern:

" Be it known that I, RICHARD HERvIG, residing at Chicago, Illinois, and being a subcertain new and useful Improvements in Lathe Attachments, of which the following 4is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use-the same, reference being had to the accompanying drawings, which illustrate the preferred form of the invention, thoughit is to be understood that the invention is not limited to the exact details of construction shown and described, and it is obvious that various modifications thereof within the scopeV of the claims will occur to persons skilled in the art.

In said drawings:

ment for turning work off centery applied thereto;

Fig. 2 is a transverse section through the chuck, beingtaken on the line 2-2 of Fig.

4, and showing the chuck connected with thek spaced lever arms;

Fig. 3 is another section through the chuck taken on line 3-3 of Fig. 2 and parallel with the direction of the chuck axis; h

Fig. Lisis a similar section taken at right angles to the section of Fig'. 3 and on theV at right angles to Fig. 7

Fig. 9 1s a side elevation of a relatively inner tubular member adapted to be incased by the cylindrical member of Fig.y 5, and illustrates the keyways and guideways formed therein; l l

' Fig. 10 is another `similar view taken at right angles to Fig. 9 with the axis of. the tubular member lying in the same direction; Fig. 11 is an end elevation ofthe tubular member of Figs. 9 and 10;

Fig. 12 is a view somewhat similar to Fig. 2, one-half thereof being in section` and Figure 1` is a side elevation of a portion` of the lathe showing my improved attach-` the otherhalf showing the assemhled'chuck 1n end elevation, said figure being taken on' 4the line 12-#12 of Fig. 13; ject of the King of Norway, have invented' lF ig. 13 is a `horizontal section taken on the line 13-,13 of Fig. 12 and showing the 'axis of the holder and work eccentrically disposed to the axis of the chuck driving spindle;

specification of Letters 15atent. i Ptnted pFeb, 12, 1918;` A

Figli shows a view wherein the tool has l just finished a cutting operation on the Work; Y

Figs. 15, `16 and 17 represent side, plan l `and end views of the finished product; and

Figs. 18 to 25 inclusivediagrammatlcally illustrate, in quarter, turns, the different positions assumed by the Work in relation to the tool while the work is rotating in eccentric positions.

This invention relates to mechanism, one of the purposes of which is ,to cut rotating work to give it a substantially oval or elliptical cross section. l Itis proposed to use the invention as an attachment to a lathe, but it f' should be clearly understood that it is not limited to association with a lathe alone, as it may be advantageously used in connection with boring machines and other devices.

,A peculiarly constructed chuck is employed that includes a holderand a rotatable member adapted to revolve'y such holder. The rotatable member is arranged to main tain the holder concentric to the driving spindle, when so desired, but= is adapted to be shifted transversely of the chuck to eccentrically position the axis of the holder at either side of the spindle axis.

In coperation with the rotatable member, the holder is adapted to grip work, which may extend through and beyond such holder to be subjected to cutting treatment byan appropriate tol. Because of the construc' tion, ther work may be in lengths representing multiples of the finished product, and may be fed through. the chuck, each multiple portion thereof being held in successive order for treatment, after which the portionmag be cut off.

s the holderand work gripped by it may be shifted to andeccentrically held at either side of the axis of the spindle, the work may be cut by the tool for only half of its circumferential surface, leavingthe remaining half of said surface in its original condition. Also, the holder may be transferred from the eccentric position at one side of the spindle axis to a diametrically oppositeposition on the other side thereof, and both Sides of the.

work may be cut to give the work a substantially elli tical cross section.

Instea of retainin work, the holder may grip a tool to be `use for eccentric cutting, under which circumstances it will be useful when employed with a lathe or with a boring machine.

\ Various other features. of novelty and' utility will become apparent hereinafter, and, of course, are to be considered as coming within the scope ofthe present invention. v l I Referring to the drawings, A represents in side elevation an end portion of a lathe to which my attachment is applied. kA

chuck C is applied to the lathe spindle, whichspindle is not shown in Fig. 1, the -chuck-receiving'portion of said spindle S being illustratedin Figs. 3, 4 andv 13.

The chuck proper is provided with an inner tubular member l internally threaded cylindrical, but internally is eccentric to the axis of member 4 in two directions, where by the inner surface of the shell of member 4 contacts only with diametrically opposite arcuate portions of member 1, member 4 being, therefore, displaceable in opposite diections transversely of inner tubular mem- Inner tubular member 1 and relatively outer cylindrical member 4 are connected by keys 7, each of which in side elevation appears as the `segggment of a circle. As shown,

two such keys 7 are employed at each side of the chuck C. .Keys 7 are driven through longitudinally spaced slots 8 through opposite sides of cylindrical member 4, being pushed therethrough to enter the recesses or keyways 2 in the inner tubular member 1. Fach key is provided with a dowelpin hole which is brouoht into register with other dowel pin holes 9 passing longitudinally through the shell-of outer cylindrical member 4. Dowel pins 10 are driven through.

the holes 9 of cylindrical member v4, and

the holes in the segmentally shaped keys 7. When the dowel vpins 10 are finally positioned, thearcuate surfaces of -keys 7 continue thecylindrieal surface of member 4 v throughout the lengths of the slots 8, and

pins 10 rigidly hold keys 7 in the positions indicated.

When members 1 and 4 are-so keyed toi y loosely surrounds the inner tubular member J 1, this arrangement of the keys allows the cylindrical member 4 to be guidedly slid transverselyof the chuck and its inner tubular member 1. It will also be seen that theguiding surfaces or track portions of the keys 7 are rotated by theinner tubular membe'r 1 and the keys in turn rotate the outer cylindrical member 4,. 'l

Surrounding outer cylindrical member 4,

andslidable longitudinally thereof, lis an annulus 11. 11 is provided with an annular projection l2, later referred to. Diametrically opposed annulus 11, receivin screws 16, which pro] ect into slots'14 in the shell of cylindrical memberI 4, which slots are diametrically opposed and extend ,longitud-inally of said member 4.

On its outer surface annulusl Before annulus 11 is slipped over outer cylindrical member 4, guide blocks 15 are positioned within slots 14 of said member 4. Said guide blocks bear against the angularly disposed guideways 3 of inner tubular member 1 and are adapted to slide longitudinally thereof They also are c provided with threaded holes into which the screws 16 are threaded. Therefore guide blocks 15 are aiixed to and substantially constitute extensions of the sliding annulus 11.

A divisible coupling ring comprising a pair of annular portions 17 and 17a, united by a set of circumferentially distributed screws 18, connects the sliding annulus 11 with the spaced arms 19 of a lever 20, hereafter referred to. It is immaterial exactly how the ring. 17"-17a is divided,'but a goody method is shown in the drawings wherein the part 17 is receed and the complementary portion 17a is a plain ring screwed to y part 17 forming an annular recess in which is'seated the annular external extension of the sliding annulus 1l. Annulus 11 anddivisible ring 17-1711 are so connected that the chuck and annulus 11 may rotate readily without causing rotation of the divisible y ring, which acts much like an eccentric strap about an `eccentric and is provided to shift annulus 11 longitudinally of the axis of the cvlindrical member 4. Projecting from the divisible ring 17-17a in opposite directions on thesame diametrical line, are trunnions 21 which project through slots 221m the 90 countersunk holes 13 pass through sliding therein countersunk. v

i spaced arms r19 of lever 20, suitable nuts threaded onto the ends of trunnions beingl 21, t ereb retaining theJ lever arms l19 between sai nuts and the divisible ring.

Positioned within the relatively inneri tubular member 1, isa collet or holder-23 which is movable longitudinally ofthe axis of the chuck and also transversely thereof to an 'appropriate degree for a pur ose later explained. The outer end of hol er Aor collet 23 is tapered to correspond substantially to the tapenof the wall of the hole 6 in the endl 5 of outer cylindrical member 4, and is provided with one or more slots, whereby said outergend of holder 23 is compressible. Before the trunnions 21 of the divisible y, ring 177-17'a are seated in the slots 22', the

tal ofthe lathe until the holein lever 20 Another point K on chuck Cis in condition for attachment to the threaded end of spindles.

Previously to attaching chuck C to spinL die S, the holder 23 is rather forcibly .pushed into the tapered hole 6 in the wall 5 of c lindrical member 4y to temporarily uni yj it therewith. yThereafter the, lever M, shown in Fig. 1i, is thrown to the left, and through mechanism well understood in thelathe art, a plunger P is retracted-by 'bein moved also to the left. This having been one, the inner tubular member 1 is screwed onto the end of spindle S, after which work, such as a drill rodR, is passed from the left in Fig. 1 through the tubular plunger P and 'tubular holder 23, the latter having been pushed inwardly to allow it to expand. Lever M lof Fig. 1 is then thrown to the right, whereupon plunger P moves toward the outer end of the chuck, forcing holder `23 into the tapered hole 6 in wall` 5 of cylindricalmemv ber 4, the outer end `of said holderf23 being thereby compressed4 to tightly grlp the work. If power now be a plied'` to the lathe pulley Z, the spindle will be caused to rotate, rotating the chuck C and the work R.

If lever 20, best shown in Fig. 1, is in its central position, the guide blocks 15 will be in their neutral positions, midway the lengths of guideways 3, and, therefore, the

axis ofthe holder and cylindrical member .f 4 will be coincident with the axis of the lathe spindle, and `consequently the work will be rotated on the true center of the lathe.` A. tool T,'such as is shown in Fig.

"14, may then be driven transversely of the work R to engage the outer surface thereof,

and will,. under these conditions, cut the workin a concentric manner. 4

If it be desired to produce an elliptical cross section,`by the useof tool T, in the rod R to produce such `a product as is shown in Figs. 15 to 17 inclusive, the' following operations will take place: y The lever 20 will be moved from its central position as shown in Fig. 1` to the right along a sector 24 secured toa bearing pedesregisters `with hole 25 -in sector 24g/'pin y26` v or other device passing through: the" lever 20 andsector 24 to lock lever 20 in its right hand position. `In so moving Jlever 20, its arms 19 through trunnions 21 shift the divisible ring 17---17 and annulus 11 in the same direction. Guide blocks 15 traverse the lncllned guidewa s or faces 3of member 1 `in moving towar the outer end of the chuck. f

The outer cylindrical `member 4 and holder 23` will therefore be moved to the left as shown in Figs. 12 and 13. The inner end ofv holder 23 floats within the tubular spindle S, there being suiiicient clearance to ermit" the eccentric positioning of the hol er, as just indicated.

The spindle S may now be rotated and the tool T advanced to engage the outer surface of the work. i

What transpires thereafter will best be understood by reference to the diagrammatlc Figs. 18 to 21 inclusive in which the full lines represent the actual metal present;

the axis ofthe spindle and they holder in its i eccentric position. Let `O represent a point on the outersurface of the workV opposite the center O of the work. Forconvenience the `various stages of the operation are shown in quarter turn steps, but `the operation is continuous, there being no necessity to stop the machine for adjustment when the work is shifted from one position to another. Fig. 18 shows the work in contact with the tool T and about to revolve for a quarter turn. As the keys 7 cause members 1 and4 to rotate as a unit about the spindle axis, 'member 4 acts in eiiect as an eccentric' on said spindle, and with annulus 11 member 4 revolves about its own axis, in divisible ring '17-172 As the work turns points O and O approach the point of .tool T. At the end of the quarter turn,` points O and 0` are positioned as indicated in Fig. 19 and the metal between the dotted and full lines has been removed. Progressing for another quarter turn without stop points O and O travelI concentrically about the cenm ters of the spindle and the work, respectively, until they reach the positions shown in Fig. 20. and having` arrived at these locations it Will be found that half ofthe rod hasbeen The crosses represent the position dotted lines.

the uncut portion of the circumference of the Work will, through the next quarter turn, move toward the tool T and when it comes opposite to said tool T will be found to be spaced 1n- 5 Wardly therefrom a distance equal tol the degree, of eccentricity between the spindle axls and the axis of the Work. T his position of point K is indicated 1n F 1g. 21, 1n which figure the origlnal axis of the Work is shown to have been returned tothe true one side of the Work having been performed.l

The-lever 20, as shown in Fig. 1, is now moved Without interrupting the lathe opera-- tion to the left to have thel hole therein register with sector hole 27, pin 26 being again used to hold lever 20 in this latest position. As before, the guide blocks 15 will slide along the inclinedV Ways or faces 25 of inner member 1, but this time toward the rear of chuck' C, shifting .annulus 11, and therefore cylindrical member 4 and holder 23. The axis of the Work, and hence holder 23 and cylindrical member 4, is consequently 30 shifted, as shown in Fig. 13, to the opposite side of the lathe axis X to be eccentrically disposed at Y substantially as it Was first positioned at Y. ,y A Continued rotation of holder 23 by member 4, which is driven by inner tubular member 1 secured to spindle S, causes the Work R to rotate in the same directionas it previously did. Fig. 22 shows the tool about to begin cutting the hitherto uncut half of the Work. The successivevsteps are shown in Figs. 22 to 25 inclusive and are similar to those illustrated in Figs. 18 to 21 inclusive.

center O of the work, though now shifted to the opposite side of the spindle axis, is rotated about the same path concentric to the spindle axis. Point K is positioned on the periphery of said Work in a position corresponding to O in Figs. 18 to 21, but diametricall'y opposite to O. Points O and K move in the same relation to the toolT as did points O and O when the opposlte side of the Work Was being cut, and, after 'the successive quarter turns,`are ositioned as shown in Fig. 25. The part o the/Work thatk has been cut by the tool Will then be found to be substantially elliptical, and in cross section is possessed of points N and J just adapted to touch' the nose of tool T during continued rotation, when point O has been once more returned to coincide with the axis of the spindle, points O and KA 'clearing the point of the tool.

It is obvious that the attachment may be In Figs. 22 to 25 inclusive, the originalv coincidence.

used in other ways, and that instead of gripping Work the holder 23 may retain a tool. Such a tool so gripped by holder 23 .may be used in ec'centrical y cutting the end of work set up 1n a lathe, or a tool for a boringl ma- 70 f chine may have its stem held by holder 23.

What I claim is:

1. In combination in mechanism of the character described, a revoluble spindle, a chuck comprising members connected for rotation by said spindle one being displace-y able eccentrically thereof, a holder rotatable about the spindle axis by said displaceable member, and meansmovable axially of the latter member to shift the same and saidholder transversely of said spindle.

2. In combination in mechanism ofthe character described, a rotatable spindle and a holder connected for simultaneous rotation, said holder being movable to positions concentric and eccentric to said spindle, and means movable axially of the holder axis for vselectively so moving said holder adapted to hold the same in the selected position.

3. In combination in mechanism of the character described, a rotatable spindle, a chuck driven thereby comprising a member movable to be concentric or eccentric to 'said spindle and provided Withan opening in a portion of itself, a floating compressi- .ble holder in` said member, and means mov-- able to drive said holder yinto the opening in said member, whereby the wall ofthe opening causes said holder to grip an ob- ]ect. `f

4. In combination in mechanism of the characterdescribed, a rotatable spindle and a chuck comprising an inner member secured to said spindle, an outer member rotatively driven by the inner member vand mounted to slide transversely thereof, a holder rotatable by said outer member, and means movable longitudinally of said chuck to shift said outer member a'nd holder transversely of said spindle. 1,10 `5. In combination in mechanism of the y character described, a rotatable spindle and a chuck comprising inner and outer members and a holder, said spindle and inner member ,having a common axis and said outer memberand holder having another common axis., and means co-acting with, and movable axially of .said inner and outer members to bring said axes into and out of 6. In combination-in mechanism of the character described, a spindle, and a chuck comprising a spindle-rotated inner member with longitudinal portions angularly disposed to the spindle axis, an outer member rotatable by and transversely displaceable of said inner member, a holder movable therewith, anda device slidable lon itudinally ofsaid outer member provide vwith extensions adapted to co-.act with the angube displaced and to displace said outer member. v

8. In combination in a chuck, a rotatable inner member, an outer member rotatable thereby displaceable transversely but not longitudinally thereof, a holder movable into engagement with said outer member to be rotated therewith, anda device embracing said outer member and held to slide on both members and angularly to the axis of the chuck to displace said outer member and holder.

9. In combination in a mechanism of the character described, a rotatable spindle, and a chuck comprising an inner member rotatable by and about the axis of said spindle, an outer transversely displaceable member driven -by said inner member, a holder adapted to float with respect to said spindle and inner member and rotatable about the spindle axis by said outer member, said holder and outer` member having a common axis which is transferable to opposite sides of the spindle axis.

10. In combination in a mechanism of the character described, a rotatable spindle, a chuck comprising an inner member rotatable by and about the axis of said spindle, an outer transversely displaceable member driven by said inner member, a holder adapted to oat with repect to said spindle and inner member, vsai holder and outer member having an axis common to both, which axis is rotatable about and transferable to opposite sides of the spindle axis,

and means maintaining said outer member and said holder concentric or eccentric to said spindle at will.

-- to grip ano 11. In combination vin mechanism of the character described, a tubular spindle, a glunger movable longitudinally therein, a

ollow spindle-rotated member, another `member adapted to be driven thereby displaceable to either side of the spindle and provided with -a hole through `its wall, and a compressible holder adapted to be driven by said plunger against the wall of the hole ject and to have its axis ro tated about the centric thereto.

12. In ,combination in mechanism of the character described, a spindle, a chuck spindlel axis when it is ecadapted to be rotated thereb comprising a member and a holder rotatab e about a comtransversely displaceable and having a hole` therethrough, and a tubular slitted holder adapted to float transversely of said spindie, work being adapted to pass through said plunger and holder, said plunger being adapted to drive said holder against the wall of the hole to cause it to grip work.

14. In combination in a chuck, a tubular member for attachment to rotary driving means, a cylindrical member incasing and transversely displaceable of saidtubular member, keys uniting both members on which said cylindrical member is slidable, and a holder rotatable with said latter member.

15. In combination in a chuck a circumferentially recessed tubular member for at tachment to rotary driving means, a circumferentially slotted cylindrical member increasing said tubular member, keys seated inthe recessesand slots of said members and conformed to the outer surface of said cylindrical member, the latter being slidable on said keys transversely of said tubular member, means locking said keys to said tubular member and a holder rotatable vwith said cylindrical member.

16. In combination in a chuck, a rotary member adapted to be driven and provided with parallel sides inclined to its axis, a

member outwardly cylindrical -loosely suring extensions displaceable by said inclined l parallel sides to eccentrically displace said cylindrical member and holder.

17. In combination in a chuck, a rotary member adapted to be driven and provided -with parallel ,sides inclined to its axis, a

member outwardly cylindrical loosely surrounding the first member and provided with longitudinal slots, a holder rotatable thereby, a device conformed to and slid'able longitudinally of the circumferential portion of said cylindrical member and having extensions ada ted to be moved along sa d inclined par e1 sides to position said Aio cylindrical member and holder concentrically and eccentrically of the first member.

18. In combination'in a chuck, a rotary member provided with parallel sides inclined to its axis, an outwardly c lindrical member loosel surrounding the rst member and provi ed with longitudinal slots, a holder rotatable thereby, an annulus about and slidable longitudinally of the circumference of said cylindrical member, and guides secured thereto passing through said slots and adapted to move alon saidv inclined parallel sides tolaterally shlft said annulus and cylindrical member.

lf 19. A chuck comprising a rotary member having inclined ways, an outwardly cylindrical slotted member incasing the Same and rotatable thereby, a holder rotatable there-v by, an annulus surroundin said cylindrical member and provided witg guides adapted to move along said inclined ways, a divisible ring holding said annulus and having trunmons, in combination with means mounting sa1 d trunnions and movable to slide said guides andl shift said cylindrical member and holder.

In witness whereof I have hereunto set my hand.

RICHARD HERVIG.

It, is hereby certified that in Letters Patent No. 1,256,131, granted February 12,

1918, upon the application of Richard Hervig, of Chicago, Illinois, for an improvement in Lathe Attachments, an error appears in the printed specification requiring correction as follows: Page 5, line 100, claim 15, for the word incr-easing" read encamlng; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the caso in the Patent Oflee.

Signed and sealed this 19th day of Merch, A. D., 1918.

[SEAL] R. F. WHITEHEAD,

Acting Commissioner of Patents. Cl. 29108- 

